Can you make the distinction between "centralization" vs "composition" of errors? Do you mean the fact that there must be some if-statement within the API that

Can you make the distinction between "centralization" vs "composition" of errors? Do you mean the fact that there must be some if-statement within the API that reacts to the different errors and sets a flag used by the Err() method? Is you opinion that "composition of errors" always requires special syntactic elements such as the match statement? The code from the blog section: scanner := bufio.NewScanner(input) for scanner.Scan() { token := scanner.Text() // process token } if err := scanner.Err(); err != nil { // process the error }